Intensive Medical Management to Prevent Large and Small Artery Atherothrombotic Stroke: Time to Expand the Horizon | Cardiology | JAMA | JAMA Network
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July 1, 2021

Intensive Medical Management to Prevent Large and Small Artery Atherothrombotic Stroke: Time to Expand the Horizon

Author Affiliations
  • 1Department of Neurology, Chang Gung University College of Medicine, Chang Gung Memorial Hospital, Chiayi Branch, Puzi, Taiwan
  • 2Department of Neurology, University of California, San Francisco, San Francisco
  • 3Department of Neurology and Stroke Center, University of California, Los Angeles, Los Angeles
  • 4Associate Editor, JAMA
JAMA. 2021;326(3):217-218. doi:10.1001/jama.2021.9917

For the past 2 decades, pharmacologic medical management to prevent first and recurrent ischemic stroke due to large and small artery atherothrombosis has focused on a 3-agent class approach: antithrombotic therapies, blood pressure– lowering medications, and low-density lipoprotein (LDL) cholesterol lowering with statins.1 However, in recent years randomized trials have demonstrated that several additional medical-pharmacologic strategies can confer additional protection. Because these advances have occurred incrementally and often with ischemic stroke prevention as just 1 component of general cardiovascular event prevention, they are not yet widely appreciated or used by general neurologists and vascular neurology clinicians. Increased awareness of these new agent classes and the evidence supporting them could help facilitate their routine addition to neurologic practice to attain the maximal possible reduction in stroke risk for patients.

LDL Cholesterol Lowering With Additional Agent Classes

Cholesterol absorption inhibitors (eg, ezetimibe) and proprotein convertase subtilisin/kexin type 9 (PCSK-9) inhibitors (alirocumab and evolocumab) have been widely demonstrated to significantly reduce LDL cholesterol levels, and their efficacy in reducing stroke has been demonstrated in clinical trials. A meta-analysis of 6 randomized clinical trials (n = 21 205 patients) indicated that ezetimibe added to statins compared with same-dose statins was associated with lower risk of nonfatal stroke (absolute risk, 2.7% vs 3.2%; risk ratio, 0.83; 95% CI, 0.71-0.97; number needed to treat = 184).2 A meta-analysis of 39 randomized clinical trials (n = 60 328 patients) showed that PCSK-9 inhibitors (alirocumab or evolocumab) added to maximally tolerated statins were associated with reduced ischemic stroke (absolute risk, 1.1% vs 1.5%; risk ratio, 0.78; 95% CI, 0.67-0.89; number needed to treat = 305).3

Evidence from these clinical trials has ushered in what many lipidologists have termed a “poststatin era,” in which statins are no longer the only well-tolerated cholesterol-lowering class of medications with proven benefit for stroke prevention. Additional effective agent classes are now available and can serve as the primary lipid-lowering therapy in statin-intolerant patients and, when needed, as effect-enhancing agents in statin-tolerant patients. Given the higher drug costs with the addition of these agents, they are most cost-effective when used for patients at higher risk of atherothrombotic ischemic stroke, such as in the secondary prevention rather than primary prevention setting.4

Eicosapentaenoic Acid Class Agents

Agents that increase levels of eicosapentaenoic acid, 1 of the 3 main omega-3 fatty acids, substantially lower serum triglyceride levels in a manner free of the adverse effects associated with niacin, and also have beneficial effects on cell membrane stabilization and lipid oxidation. In a randomized clinical trial that enrolled 8179 patients with established cardiovascular disease or with diabetes and other vascular risk factors, among patients with elevated triglyceride levels despite the use of statins, the risk of stroke was significantly lower among patients who received 4 g of icosapent ethyl daily than among those who received placebo (absolute risk, 2.4% vs 3.3%; hazard ratio, 0.72; 95% CI, 0.55-0.93; number needed to treat = 108).5 Although the risks of major bleeding and hemorrhagic stroke did not differ significantly between icosapent ethyl and placebo, cardiac arrhythmia requiring hospitalization was more common in the icosapent ethyl group (4.6 % vs 3.8%, respectively).

In a subanalysis of another trial, 1.8 g of highly purified eicosapentaenoic acid daily (n = 485) compared with no use of eicosapentaenoic acid (n = 457) reduced the risk of recurrent stroke among Japanese patients with a history of stroke and high cholesterol who were all receiving low-dose statin therapy (absolute risk, 6.8% vs 10.5%; hazard ratio, 0.80; 95% CI, 0.80-1.00; number needed to treat = 74).6 Conversely, in a randomized trial (n = 13 078 patients at high cardiovascular risk) of eicosapentaenoic acid combined with other omega-3 fatty acids, including docosahexaenoic acid, there was no effect on stroke reduction.7 Docosahexaenoic acid increases LDL cholesterol concentrations, which may offset the potential benefits of the stroke-protective effect that eicosapentaenoic acid provides.

Insulin-Sensitizing Agents

Pioglitazone is a thiazolidinedione that increases insulin sensitivity in target tissues. A meta-analysis of 3 randomized clinical trials (n = 4980 patients) showed that pioglitazone compared with placebo was associated with reduced recurrent stroke risk in patients with ischemic stroke and insulin resistance, prediabetes, and diabetes mellitus (absolute risk, 6.4% vs 8.5%; hazard ratio, 0.68; 95% CI, 0.50-0.92; number needed to treat = 37).8 In patients without prior stroke, no significant association of pioglitazone with incident stroke was observed. Randomized clinical trials also showed that the potential risk of heart failure and weight gain can be mitigated, even eliminated, by excluding patients with a history of heart failure, using safety algorithms that trigger dose reduction of pioglitazone, and adding sodium-glucose cotransporter 2 inhibitors or dulaglutide to pioglitazone.

Glucagon-Like Peptide-1 Receptor Agonists

Glucagon-like peptide-1 receptor agonists (GLP-1 RAs) increase the synthesis of insulin by stimulating pancreatic islet cells and reducing glucagon secretion. A meta-analysis of 7 randomized clinical trials (n = 56 004) of patients with type 2 diabetes at high cardiovascular risk found that GLP-1 RAs were associated with a reduced rate of stroke (absolute risk, 2.6% vs 3.0%; hazard ratio, 0.84; 95% CI, 0.76-0.93; number needed to treat = 250).9 Homogeneous benefit was observed on stroke reduction with 6 of the 7 evaluated agents: albiglutide, exenatide, liraglutide, dulaglutide, subcutaneous semaglutide, and oral semaglutide. In contrast, lixisenatide did not show an effect, potentially related to shorter follow-up, higher use of concomitant statin therapy, and lower adherence to study medication in the pivotal trial. These data indicate that the preponderance of GLP-1 RAs could help reduce stroke risk in patients with type 2 diabetes who are at elevated cardiovascular risk.

Folic Acid

A meta-analysis of 13 randomized clinical trials (n = 65 812 patients) conducted in countries without mandatory folic acid food fortification showed that folic acid supplementation was associated with reduced stroke (absolute risk, 3.1% vs 3.7%; risk ratio, 0.85; 95% CI, 0.77-0.95; number needed to treat = 182).10 The benefit was observed mostly in patients receiving folic acid alone or a combination of folic acid and minimal cyanocobalamin (absolute risk, 2.5% vs 3.3%; risk ratio, 0.75; 95% CI, 0.66-0.86; number needed to treat = 120).10 However, folic acid had no benefit for coronary artery disease prevention and had no benefit on stroke prevention for people living in countries with folic acid mandatory fortification.

In summary, although antithrombotic agents, blood pressure–lowering drugs, and LDL cholesterol lowering with statins form the cornerstone of stroke prevention, emerging evidence from randomized trials indicates that, when added to this regimen, select agents in 6 additional pharmacologic classes could further reduce large and small artery atherosclerotic stroke in appropriate patients (Table). Even as additional trials are performed, sufficient randomized trial data have already accumulated to support the judicious use by clinicians of these expanded therapeutic options to tailor a comprehensive multimodal strategy for optimal stroke prevention.

Table.  Drugs That May Help Reduce Stroke Risk
Drugs That May Help Reduce Stroke Risk
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Article Information

Corresponding Author: Jeffrey L. Saver, MD, UCLA Stroke Center and Department of Neurology, University of California, Los Angeles, 300 Medical Plaza Driveway B200, Los Angeles, CA 90095 (jsaver@mednet.ucla.edu).

Published Online: July 1, 2021. doi:10.1001/jama.2021.9917

Conflict of Interest Disclosures: Dr Saver reported serving as a scientific consultant advising on stringent clinical trial design to Amgen and Boehringer Ingelheim and serving on a clinical trial data and safety monitoring board for Novo Nordisk. No other disclosures were reported.

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    3 Comments for this article
    Folate Treatment For Stroke Prevention
    Charles Brill, MD | Thomas Jefferson University
    A probable mechanism for folate's effectiveness is through lowering homocysteine (HC). HC can be elevated in carriers of homocysteinuria and patients who have 2 mutations for MTHFR, either homozygous or compound heterozygotes. This also applies to patients with classical migraine.
    CONFLICT OF INTEREST: None Reported
    Balderdash
    Michael Plunkett, MD MBA | Teaching
    All these purported “studies” are deeply flawed. And the NNT to stop death or any meaningful MACE is >100. Not exactly cost-effective. The appeal for reincarnating folic acid is absurd. It’s only useful in severely poor parts of the world like rural China or rural Iran.

    Stick with good cholesterol control and good blood pressure control. Those are really cheap, proven incredibly effective, and essentially side effect-free. If Statins are not effective enough, go straight to the PCSK 9 inhibitors. Not cheap (but 57s cheaper than the new Alzheimers drug) and really bring down cholesterol.
    CONFLICT OF INTEREST: None Reported
    Helpful
    H Silverstein, MD | Preventive Medicine Center
    This article is certainly in the right direction and much appreciated. It might also be helpful to point out that hypertension, diabetes, and elevated lipids can be managed without medications or supplements: not easy but so doing offers freedom from medication use, medication-induced side effects, clinician visits, time inconvenience, savings in general, and reduced risks for cancer and many other conditions.
    CONFLICT OF INTEREST: None Reported
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